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How length of wire affects an electric current passing through it
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The Length of a Wire Affects Its Resistance
Scientific Enquiry:
I know that metals are good conductors of electricity. Metals are good
conductors because their electrons are easily released allowing
electricity to flow.
The electrons can carry current because they split up from the
positive ions, so they are free to move and to carry current.
Factors that affect resistance:
1. Length – the longer the wire the more atoms there are for the
current to push through.
2. Width – there is a greater collection of atoms.
3. Material – Different materials have different atom structures so
resistance varies.
4. Temperature – the hotter it is the harder it is for current to
get through.
5. Voltage – the higher the voltage the more resistance there is.
Planning:
Aim:
The aim of this investigation is to find out how the length of a wire
affects its resistance.
Prediction:
I predict that, as the length of the wire increases so will the
resistance. I think this will happen because as the wire gets longer
the current has more atoms to get through. If the length of wire is
twice as long, the resistance will double e.g.
Length of wire: 10cm Resistance: 4Ω
Length of wire: 20cm Resistance: 8Ω
Apparatus:
Power pack – this provides energy for the circuit
3 wires – are used to connect power pack to resistance board
Resistance board – nichrome wire is tied to it and the board is used
to work out the length of wire
Nichrome wire (0.2mm) – alloy of nickel and chromium. Acts as a
resistor
Ammeter – measures current
Crocodile clips – connect wire to nichrome wire at different length
Preliminary work:
Before the main experiment I did some preliminary work to see if I
could improve on our first method. I concluded that we are not going
The experiment was performed on one subject, a 20-year-old female gymnast that weighed approximately 58.6kg. First, she performed the test with the arm bike, which had 3 stages of 25Watts, 50W, and 75W all lasting 3min each. Before the end of
He used a comparison pattern to describe telegraph invention with the internet, and how was more important to invent this device similar to the internet invention. Reading through the book gives a different criterion of the implementation and evolution of the telegraph device in Europe and United States. Although Standage’s book lacks deep technical aspects, he tells the story of telegraph invention in simple and interesting chronical way. In fact, he started his first chapter by mentioning the rumors of inventing a magical device to transfer letter between people mile apart in the late of the sixteen century. By 1791 two French scientist brothers Claude and Rene Chappe invented the first version of the Telegraph. The working principle of this device was mechanical and optical, which had failed in the dark. The Chappe brothers continued their trials until 1793 they succeeded to invent the first dependable device to transmit messages over long distances. At this time, the telegraph first named tachygraph from the Greek word tachy which means fast, then they changed to telegraph. The new invention became fully operational by 1794, where it played an important role to send a report of the capture of town from the Austrians and Prussians. The success of using the telegraph in civilian and military matter encouraged Napoleon to build wider telegraph network by 1804. During the nineteen century, the telegraph machine evolved to a wider global communication network to cross the continents especially in England and the United States, where Samuel Morse developed a newer version of the telegraph by
equation V = IR. V - volts, I - current and R - resistance. I plotted
I also decided to use a wooden block to keep hold of the wire, because
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Investigating the Effect the Thickness of a Wire has on Its Resistance. Equipment:.. Nickel Wire cut into 10 pieces of 30cm length (Ruler, Pliers). Two crocodile clips Five Pieces of Wire Power Source Variable Resistor Ammeter Volt Meter Method: The.. =
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